I saw this product on
www.W00T.com a few months ago for $25, but it was sold out. So, I searched other sites and found it for about $28, and figured I'd give it a shot.
It's basically a external wireless adapter, with a [touted] "low latency" wireless connectivity. By external, I mean it requires the use of a (supplied) power pack. It's a simple connection process, Plug-n-Play. It includes 2 ethernet cables, 2 power supplies, and 2 Play Link cubes. Just connect the each ethernet cable between your router/hub/modem/console and the Play Link cubes, then plug in the power supply, and you're all set!
It's rated for 1.5Mbps, so it doesn't scream on the downloads, but it's supposedly a low latency technology, so it may not be a bottleneck during gameplay. I've played a few games online (and with a few of you) and didn't have any noticable lag issues. As you can see (pic below), they're much larger than the little USB wireless adapters for the 360, but they can be tucked out of sight, behind the rest of your gear. Not a big deal, IMO.
One of the negatives is that it is only 1.5Mbps, which means slower Marketplace downloads. Fortunately, with the latest upgrade to the XBL Marketplace, we can "set it and forget it", so I can queue up my downloads and go to bed! I don't think the slower download speed impacts game play, due to its supposed low latency, but I'll let you guys be the judge of that. (If it's an issue, I'll just get in the attic and runs some wires.

)
For the price, it was worth a try. This will work in the place of any wired ethernet solution (Consoles, PC, Laptop).
Logitech Play Link